I also studied quantum mechanics, I feel its simpler than GR but its not intuitive.
Quantum Field Theory (QFT) which is a theory of matter being wave functions in the fields, of which the Higgs Field is one example which causes mass, does not yet include gravity. It attempts to with the graviton but that particle has never been detected and may be undetectable or not exist at all.
GR claims there is a space-time field which is bent in the presense of energy (and matter is just wave function as energy divided by square of speed of light) so there is no graviton.
LEt's put this way, you can see the black hole as it casts a shadow, the Veritasium video explains why, but when say a gravity wave passes the earth, what is actually passing, what wave function, and so what particle?
The only reasonable attempt at combining GR with quantum mechanics was done by Hawking with the Hawking Radiation which predicts black holes evaporate away eventually if they stop feeding and far enough from radiation.
All fascinating stuff. You need to be at least a BSc in Physics to begin to really understand it.
A sister of Black Holes - the attractive force of Gravity is Inflation Theory which if you get far enough into it gets the repulsive force of Gravity - yes gravity can according to GR be repulsive - to explain the Bang part of the Big Bang, and also tallies with the Dark Energy and the very strange observation the Universe is flat - Euclidean Geometry - due to Omega being 1, which if you watch the Inflation theory videos explains it.
That inflation theory video series is also fascinating but I'm still stuck and not understand the 2nd to last of the video series as my maths is letting me down, the breaking of symmetry point is, still, over my head.
So this is why Black Holes, something we can study, and Gravity Waves we can study, can help prove / disprove theories which explain the origin of the universe, something we cannot study directly as it exists beyond the observable universe and behind the cosmic micowave background (CMB).
Well bear in mind algorithms were used to make a picture from a lot of data, so there is a degree of human interpretation within the image, so there is a small chance it is wrong but they put different teams on it and they came up with very similar photos so its probably correct.
If you're in the UK, or know how to be , then BBC has a documentary on the photo
I wonder if our species had suppressed superstitions and embraced the scientific method earlier how much more advanced we be now, basically modern physics only really started around 17th century after finally religion began its retreat of suppressing finding truth such as when they emprisoned Gallileo and executed anyone who would not accept religious dogma. Thankfully we live in more free world where truth comes more commonly from observation than some old book.